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| BioSurf – Transformácia bioinertného na bioaktívne prostredníctvom povrchového inžinierstva | |
| Transforming bioinert to bioactive through surface engineering | |
| Program: | JRP |
| Project leader: | prof. Ing. Galusek Dušan, DrSc. |
| Annotation: | Cieľom navrhovaného projektu je vyvinúť sklo/keramický implantát s vysokou pevnosťou a bioaktivitou. Na dosiahnutie hlavného cieľa bude potrebné vyriešiť nasledujúce úlohy:a) modifikácia povrchu implantátu úpravou studenou plazmou s cieľom zabezpečiť dostatočnú adhéziu bioaktívnych povlakov na bioinertný keramický (ZrO2) substrát.b) príprava viacvrstvových povlakov z bioaktívnej keramiky na báze hydroxyapatitu (HA) a/alebo síranu vápenatého (CaSO4), ktoré pozostávajú z rozpustnej vrchnej vrstvy a z medzivrstvy (medzivrstiev) bioaktívnej keramiky zabezpečujúcej pevnú väzbu so substrátom.c) príprava povlakov z mezopórovitých bioaktívnych sklenených častíc pripravených pomocou sol-gélu, ktoré sú dopované rôznymi terapeutickými anorganickými iónmi, ktoré by vyvolali bioreakciu okolitého tkaniva.d) hodnotenie biologickej účinnosti povlakov testovaním in vitro životaschopnosti buniek, bioaktivity a mechanických vlastností (pevnosť priľnavosti, odolnosť proti opotrebovaniu) povlakovaných implantátov. |
| Duration: | 1.1.2023 – 31.12.2025 |
National
| CoSinG – Studené spekanie skiel | |
| Cold sintering of glass | |
| Program: | SRDA |
| Project leader: | Ing. Michálková Monika, PhD. |
| Annotation: | Glass is routinely produced on an industrial scale by cooling a glass forming melt. This versatile and well-established method facilitates the production of a large variety of compositions and shapes. However, it has its limits in terms of the maximum cooling rate that can be achieved, preventing the production of compositions with high tendency to crystallization. Also, it cannot produce complex shapes, such as bioactive glass scaffolds or glass filters with hierarchical porosity, or multicomponent and multilayered parts. To prepare such parts, glass powders (frits) are processed by advanced shaping methods known from ceramic technology, such as additive manufacturing or tape casting. The green compacts are then consolidated by viscous flow sintering at temperatures exceeding the transition temperature (Tg) of the respective glass. However, viscous flow sintering often results in partial or complete crystallization of the glass, impairing its properties (e.g. bioactivity, mechanical properties). The proposed project is thus focused on developing and optimising cold sintering of selected types of glass. These include (i) aluminate glasses with a high tendency to crystallisation that cannot be prepared by conventional cooling of the melt, (ii) complex shapes (scaffolds) of bioactive glasses with hierarchical porosity prepared by additive manufacturing, (iii) complex shapes (glass filters for wastewater remediation) from hitherto unrecyclable borosilicate pharmaceutical glass and (iv) multilayered glass structures prepared by tape-casting with tailored gradient of refraction indices and thermal expansion. As the densification of glass via the cold sintering process is not fully understood, fundamental studies of densification mechanisms will be also carried out. The results obtained in the project are of great industrial and scientific interest, contributing to (i) development of a new industrially scalable process of production of glass parts. |
| Duration: | 1.7.2024 – 30.6.2028 |
| Vývoj pokročilých luminiscenčných sklenených 3D štruktúr pomocou aditívnej výroby | |
| Development of advanced luminescent glass 3D structures by additive techniques | |
| Program: | VEGA |
| Project leader: | Ing. Michálková Monika, PhD. |
| Annotation: | The main goal of the project is to develop a new generation of luminescent phosphor-in-glass (PiG)optoelectronic materials with high efficiency, low-cost fabrication (3D printing), and tailored luminescenceproperties. Additive manufacturing will enable the combination of mutually supporting phosphors in differentlayers within a single glass matrix, thus improving the optical properties of the final material. In addition, thephosphors used for additive manufacturing will be prepared in spherical shapes – microspheres that can be solidor hollow – to further enhance the efficiency of the phosphor. |
| Duration: | 1.1.2024 – 31.12.2027 |
| Hlinitano-kremičitanové sklené a sklokeramické materiály spevnené iónovou výmenou a dodatočnými funckionalitami | |
| Ion exchange strengthened aluminosilicate glass/glass-ceramics with additional functionalities | |
| Program: | VEGA |
| Project leader: | prof. Ing. Galusek Dušan, DrSc. |
| Duration: | 1.1.2021 – 31.12.2024 |
| Luminofory s nulovým teplotným zhášaním luminiscencie pre aplikácie v pc-WLED s NUV excitáciou | |
| Zero-thermal-quenching phosphors for NUV converted pc-WLEDs application | |
| Program: | VEGA |
| Project leader: | prof. Ing. Galusek Dušan, DrSc. |
| Annotation: | The project is focused on research and development of new type phosphors with zero thermal quenching (TQ) behaviour, for potential application in light sources based on conversion of excitation light in NUV spectral range (produced by LED chip) to visible light, such as high power HB LEDs (high brightness LED) or laser lighting.Phosphors will be prepared as powders/nano-powders and as PiG (Phosphor in Glass) composites. The effect of activator and co-dopant concentration on PL emission intensity produced by phosphor under NUV excitation will be investigated. Photoluminescence properties of phosphors containing rare-earth and transition metal ions will be studied in detail with special attention on near-zero/zero TQ behaviour of phosphors up to 250°C. The attention will be paid to study of relations between luminescent properties of materials and their structure and morphology. |
| Duration: | 1.1.2022 – 31.12.2024 |